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This 125-year old opera house is a study in grandeur: its rust-red sandstone façade in Romanesque revival style; the proscenium arch flanked by ornate box seats; the second-story lobby with its stunning, panoramic view of Aspen Mountain. Once inside, the opera house's programming is decidedly more modern, a mix of symphonies and stand-up (past partnerships include the Aspen Writers’ Foundation and HBO’s Comedy and Arts Fest). If you missed its annual Aspen Laff Festival in early 2016, then make it a top destination this summer, when the MountainSummit MountainFilm arrives (Aug. 24–28). They’ll fête the 100th birthday of the National Park Service, offering viewers a big screen glimpse of some other far-flung—and much-beloved—national treasures.